Reactive oxygen species production pathway (ROS production pathway)

The reactive oxygen species (ROS) production pathway refers to the collective biochemical mechanisms responsible for generating oxygen-derived free radicals and non-radical oxidants within a cell (Sies & Jones, 2020). Key enzymatic sources include the NADPH oxidase (NOX) family, xanthine oxidase, and the mitochondrial electron transport chain, where electron leakage leads to the formation of superoxide anions (Di Meo et al., 2016). Under physiological conditions, ROS act as vital signaling molecules that regulate cell growth, differentiation, and the innate immune response against pathogens (StatPearls, 2023). However, an imbalance between ROS production and the cell's antioxidant defense mechanisms leads to oxidative stress, a state characterized by oxidative damage to lipids, proteins, and nucleic acids (NIH, 2024). This damage is a hallmark of various pathologies, including chronic inflammation, neurodegenerative disorders like Alzheimer's disease, and various forms of cancer (PubMed, 2023). Therapeutic strategies targeting this pathway involve the use of specific enzyme inhibitors, such as NOX inhibitors, or antioxidant compounds that scavenge excess ROS to mitigate tissue damage (PubChem, 2024). Despite their therapeutic potential, targeting ROS production is challenging because basal levels of ROS are necessary for normal cellular homeostasis and host defense (Nature Reviews, 2020).

Other names

ROS generationOxidative stress pathwayPro-oxidant pathwayReactive oxygen species metabolism

Inhibition of ROS-generating enzymes (e.g., NADPH oxidase, xanthine oxidase), scavenging of reactive oxygen species, and modulation of mitochondrial electron transport.